Alloying effect on superconductivity in amorphous lanthanum-based alloys

Journal Article · Mon Jan 01 04:00:00 EST 1979 · Phys. Rev., B; (United States)

DOI:https://doi.org/10.1103/PhysRevB.19.193· OSTI ID:6465654

Agyeman, K; Mueller, R; Tsuei, C C

The effect of alloying on the superconducting properties of amorphous, liquid-quenched La-based alloys containing Al, Ge, and Au is studied. The transition temperature T/sub c/ of these superconductors depends largely on the La content and is not very sensitive to the second alloy constituent throughout the composition range investigated (approx.65--83-at.% La). From the data on T/sub c/, the temperature dependence of the upper critical field H/sub c/2(T), and the residual-resistivity values, we estimate the coherence length xi (o), the density of states at Fermi level N (E/sub F/), and the electron-phonon coupling parameter lambda as a function of alloy concentration. The implication of these results is that the electron-phonon interaction strength is essentially constant, suggesting that superconductivity in these alloys is of a localized nature.

• Research Organization: IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598
• OSTI ID: 6465654
• Journal Information: Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 19:1; ISSN PLRBA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ALUMINIUM ALLOYS
AMORPHOUS STATE
COHERENCE LENGTH
CRITICAL FIELD
ELECTRON-PHONON COUPLING
ENERGY LEVELS
ENERGY-LEVEL DENSITY
FERMI LEVEL
GERMANIUM ALLOYS
GOLD ALLOYS
LANTHANUM ALLOYS
LANTHANUM BASE ALLOYS
MAGNETIC FIELDS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE